M.Sc. Tezi Görüntüleme

      There are three types of backfill methods; namely, hydraulic fill, rock fill and paste backfill with the latter becoming increasingly widespread world-wide. The possibility of placing all the tailings produced and hence the significant reductions in the tailings disposal and rehabilitation costs are the most important advantages of the paste backfill. In particular, the tailings containing sulphide minerals that are unstable in the presence of air and water posing the environmental problems (i.e. the formation of acid mine waters) may well be placed safely in underground as paste backfill.

      The results showed that the optimum cement content of the paste backfill mixture with a compressive strength of 1.387 MPa at 28 days was 7 wt. % at a slump consistency of 7.0" for the spec ore tailings. The highest compressive strength of 0.812 MPa at 6.0" slump consistency was determined for the paste backfill prepared from the clastic ore tailings when the backfill mixture contained 7 wt. % of cement. From the short and long term tests, PKC/B 32.5-R type binder has showed a positive effect on the paste backfill strength. Additionally, desliming with 5 wt. % binder has allowed for an average increase in the order of 40 % after 28 days curing period.